#ifndef _PLUGIN_COMMON_H_
#define _PLUGIN_COMMON_H_

#include <stdio.h>

#define PLUGIN_BUF_LEN 1024

#define NSISAPI extern "C" __declspec(dllexport) void __cdecl


#define EXDLL_INIT()           {  \
        g_stringsize=string_size; \
        g_stacktop=stacktop;      \
        g_variables=variables; }



typedef struct _stack_t {
  struct _stack_t *next;
  char text[1];
} stack_t;


static unsigned int g_stringsize;
static stack_t **g_stacktop;
static char *g_variables;

enum
{
INST_0,         // $0
INST_1,         // $1
INST_2,         // $2
INST_3,         // $3
INST_4,         // $4
INST_5,         // $5
INST_6,         // $6
INST_7,         // $7
INST_8,         // $8
INST_9,         // $9
INST_R0,        // $R0
INST_R1,        // $R1
INST_R2,        // $R2
INST_R3,        // $R3
INST_R4,        // $R4
INST_R5,        // $R5
INST_R6,        // $R6
INST_R7,        // $R7
INST_R8,        // $R8
INST_R9,        // $R9
INST_CMDLINE,   // $CMDLINE
INST_INSTDIR,   // $INSTDIR
INST_OUTDIR,    // $OUTDIR
INST_EXEDIR,    // $EXEDIR
INST_LANG,      // $LANGUAGE
__INST_LAST
};


static int __stdcall popstring(char *str)
{
  stack_t *th;
  if (!g_stacktop || !*g_stacktop) return 1;
  th=(*g_stacktop);
  lstrcpyA(str,th->text);
  *g_stacktop = th->next;
  GlobalFree((HGLOBAL)th);
  return 0;
}


static void __stdcall pushstring(char *str)
{
  stack_t *th;
  if (!g_stacktop) return;
  th=(stack_t*)GlobalAlloc(GPTR,sizeof(stack_t)+g_stringsize);
  lstrcpynA(th->text,str,g_stringsize);
  th->next=*g_stacktop;
  *g_stacktop=th;
}

static int __stdcall popint()
{
    char buf[512] = {0};
    popstring(buf);
    return atoi(buf);
}

static void __stdcall pushint(long value)
{
    char buf[512] = {0};
    sprintf_s(buf, "%ld", value);
    pushstring(buf);
}

static char * __stdcall getuservariable(int varnum)
{
  if (varnum < 0 || varnum >= __INST_LAST) return NULL;
  return g_variables+varnum*g_stringsize;
}

static void __stdcall setuservariable(int varnum, char *var)
{
	if (var != NULL && varnum >= 0 && varnum < __INST_LAST) 
		lstrcpyA(g_variables + varnum*g_stringsize, var);
}




enum NSPIM 
{
    NSPIM_UNLOAD,    // This is the last message a plugin gets, do final cleanup
    NSPIM_GUIUNLOAD, // Called after .onGUIEnd
};

typedef UINT_PTR (*NSISPLUGINCALLBACK)(enum NSPIM);

// extra_parameters data structures containing other interesting stuff
// but the stack, variables and HWND passed on to plug-ins.
typedef struct
{
    int autoclose;
    int all_user_var;
    int exec_error;
    int abort;
    int exec_reboot; // NSIS_SUPPORT_REBOOT
    int reboot_called; // NSIS_SUPPORT_REBOOT
    int XXX_cur_insttype; // depreacted
    int plugin_api_version; // see NSISPIAPIVER_CURR
    // used to be XXX_insttype_changed
    int silent; // NSIS_CONFIG_SILENT_SUPPORT
    int instdir_error;
    int rtl;
    int errlvl;
    int alter_reg_view;
    int status_update;
} exec_flags_t;

#ifndef NSISCALL
#define NSISCALL __stdcall
#endif

typedef struct {
    exec_flags_t *exec_flags;
    int (NSISCALL *ExecuteCodeSegment)(int, HWND);
    void (NSISCALL *validate_filename)(char *);
    int (NSISCALL *RegisterPluginCallback)(HMODULE, NSISPLUGINCALLBACK); // returns 0 on success, 1 if already registered and < 0 on errors
} extra_parameters;



#endif //_PLUGIN_COMMON_H_
